Perseid meteor shower: everything you need to know to see it

The annual meteor shower will fill the night sky with glowing streaks this weekend, as the Earth travels through debris shed by comet Swift-Tuttle

From piquing the interest of astronomers to fuelling the musings of poets, meteor showers have left a trail of inspiration in their wake since humanity first peered up into the sky.

Now inspiration is set to strike once more. This weekend the night sky will be filled with glowing streaks as the annual Perseid meteor shower reaches its peak, with the best views in the northern hemisphere.

People have looked up and noticed these showers and wondered about what they meant for thousands of years, said Chris Lintott, professor of astrophysics at the University of Oxford and co-presenter of The Sky at Night.

The Perseid shower takes its name from the point in the sky from which the meteors appear to hail: the constellation of Perseus. Named after the mythical Greek hero who defeated the gorgon Medusa by cutting off her snake-covered head, the constellation can be seen in the northern sky.

But, as Lintott points out, you dont need to be au fait with star charts to enjoy the show. [It] doesnt mean you should look towards Perseus, he said. You see more of the meteors when you are side on, so [look] east or west, and youll see them streaking past you.

Stonehenge during the 2013 Perseid meteor shower Photograph: Kieran Doherty/REUTERS

Best of all, says Lintott, its easy to revel in the celestial fireworks: just wrap up warm, let your eyes adjust to the dark and look up. My favourite thing about meteor watching is that the only equipment you really need is a comfortable chair, he said.

Dr Michele Bannister, an astrophysicist at Queens University Belfast, favours a different approach. She advises gazing up while lying on a tarpaulin and sleeping bag in order to get the widest view of the night sky.

The meteor shower is beautiful spectacle born of debris. Every year the Earth travels through dust shed by Comet 109P/Swift-Tuttle on its 133-year orbit of the sun. A dirty snowball, the comet last swept close to the sun in 1992 and is now far out in the solar system.

It is in a dance with Jupiter at the moment, said Bannister. This comet makes one loop around the sun and Jupiter makes 11 loops.

As our planet speeds through the comets train of dust, tiny particles the size of a grain of sand hit the Earths atmosphere at speeds of up to 132,000 mph, generating temperatures of thousands of degrees celsius.

They are punching through the air at very high speed, so they compress the air in front of them, said Marek Kukula, public astronomer at the Royal Observatory, Greenwich.

This is a lot of compression it heats the air and that is what causes that bright streak, he said. The meteor itself, the solid object, will burn up and that can also give you colours as the materials fluoresce.

The bright streaks can also be coloured as the materials making up the meteor burn up and fluoresce. Photograph: Jamie Cooper/REX Shutterstock

The Perseid shower is also famed for its fireballs: meteors that appear as bright as planets such as Venus or Jupiter, some of which explode. [Fireballs are] just a little bit bigger and therefore a little bit brighter than your average meteor but they can be pretty spectacular, said Kukula. They can actually have quite brilliant colours as well: reds and greens and blues.

The glory of meteor showers, notes Kukula, would have been familiar to those who lived before the age of street lights. Indeed, it has been suggested that The Rime of the Ancient Mariner by Samuel Taylor Coleridge contains a nod to a flurry of shooting stars: The upper air burst into life! the poet wrote.

But while those in the dark of the countryside might catch the best glimpse of this weekends shower, seeing about 80-100 meteors per hour, even city dwellers can expect to catch a glimpse of a shooting star every few minutes Kukula said.

And while the waning gibbous moon could make some of the fainter meteors harder to see, experts say its still worth looking out. If you want to see the best of the shower you want to get up in the early morning, after the moon has set, said Lintott. But even with the moon up, you will still see the brightest of the shower.

The link between comets and meteor showers was only revealed in the 19th century, through the meticulous calculations of the Italian astronomer Giovanni Schiaparelli. But the discovery, say experts, only adds to the wonder of shooting stars.

You can stop for a moment and [say] gee, we live in this wonderful universe with such amazing long spans of time, and yet this [dust] that has been around for so long ends its life so briefly, said Bannister.

Lucie Green, professor of physics at University College London and a co-presenter of the BBCs The Sky at Night, agreed. Theres lots of things to see in the night sky and lots of beautiful sights but generally most people dont get to see something which is dynamic, something which is changing, she added.

Read more: https://www.theguardian.com/science/2017/aug/12/perseid-meteor-shower-everything-you-need-to-know-to-see-it

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